longest

China’s longest underwater tunnel has 600,000 LED points calculated so you don’t fall asleep at the wheel

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A few months ago we unraveled everything about the Taihu tunnel in China and its LED ceiling that has turned the infrastructure into a tourist attraction. However, in addition to the very curious aesthetics offered by this illuminated ceiling, there is another reason why this infinite screen runs through the tunnel, and that is so you don’t fall asleep at the wheel. It is normal, since we are talking about the longest underwater tunnel in the country. Eyestrain. Traveling the 10.79 kilometers of the Taihu tunnel at the maximum permitted speed takes almost ten minutes under the lake, enclosed between concrete walls, without windows or external references. And it is precisely this scenario that is most conducive to the appearance of visual fatigue, a danger especially if we are behind the wheel. For this reason, when the tunnel was designed, lighting was no longer considered only a matter of visibility and aesthetics and also began to become a safety tool. Tthree “heavens” distributed along the route. The engineers divided the tunnel into three sections and placed, at the junction points between them, what the technical documentation calls a “visual wake-up system against fatigue.” There are three ceilings made up of LED dot screens, very common in tourist locations in China. Each of these roofs is made up of about 200,000 LED light pointsand the system can show different scenes, from a blue sky with clouds, a night sky full of stars or, on specific dates, the five-star flag of China. The control system can automatically switch between these scenes by time slots and sections. According to Baidu Baikethis “visual awakening” system seeks to relieve the tension and feeling of overwhelm caused by driving for a long time in a closed space. Why those colors? Those responsible for the project chose blue, yellow and cyan as the main colors of their activation zones, combined with warm tones to generate dynamic changes. There is scientific support behind this decision, since light with cold tones and short wavelengths, such as blue, has non-visual effects on the brain that go beyond allowing us to see better. Different studies have verified that the color temperature of the light influences the mood, alertness level and reaction time of drivers, something related to how this type of light stimulates the brain mechanisms that regulate wakefulness. Just like share From Motorpasión, simulator tests showed that blue-toned lights were the ones that increased drivers’ attention the most, followed by red-toned ones, precisely the colors that are repeated the most in the images showing the tunnel ceiling. On the other hand, researchers presented their results at an IEEE conference in 2024, having conducted field tests in the Taihu tunnel itself to see how different LED configurations modified the eye movements and physiological responses of drivers in real conditions. lThe walls also “speak”. Throughout the entire route, the side walls of the tunnel are decorated with stripes of blue, yellow and green that intertwine in geometric gradients, as if they were ribbons. According to they count From the local media Sohu, all this display of lights is managed by an intelligent lighting system that not only decides which scene to show and when, but also monitors its own operation. The system incorporates real-time monitoring of breakdowns, with automatic alerts that inform the exact point where a failure occurs, which facilitates the maintenance of an installation that, after all, has to operate uninterruptedly under a lake. Cover image | FeatureChina/AP (cnn) In Xataka | Chile wants a tunnel under the Strait of Magellan to link Tierra del Fuego with the continent. The project exists, the agreement with Argentina does not

A driver has crossed one of the longest tunnels in Europe at more than 170 km/h. He is now banned from driving in all of Switzerland.

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A 22-year-old German has starred one of the most talked about chases of the last few weeks in Switzerland. And his journey through the gotthard tunnelone of the busiest arteries in Europe on the way to Italy, ended with an average speed that was triple the permitted limit, a positive drug test and a permanent ban on driving throughout the country. Below these lines we tell you all the details. what has happened. According to informed Uri cantonal police, the driver was driving south on the A2 motorway at dawn when, before reaching the northern portal of the St. Gotthard tunnel, he overtook another vehicle on the right, invading a delimited area. Once inside the tunnel, he wanted to continue freaking out. Accumulating fines. Once inside the almost 17 kilometers of tunnel, the young man carried out up to 21 overtaking maneuvers on a road with a double continuous line. Their average speed, calculated by the agents, was 171.8 km/h, more than double the limit allowed in the tunnel, which is 80 km/h. Normally, it would take a driver around 13 minutes to go through the tunnel. This guy did it in six minutes. Between the lines. The Gotthard tunnel is one of the most important mountain passes of Europe and one of the preferred routes for German tourists traveling to Italy, especially in the summer months. Precisely because of its intense traffic and its two-way route, any overtaking maneuver poses a risk of collision. The tunnel also has more than a hundred cameras and sensors that allow these types of violations to be captured in detail. So there was little he could do to escape the historical burden that fell on him. The consequences. The Ticino cantonal police finally managed to intercept the driver at the exit of the tunnel, immediately imposing a driving ban on him throughout Swiss territory. In addition, they demanded bail of several thousand euros, an amount that has not been revealed. Added to this is that the rapid drug test to which he was subjected tested positiveso now a blood test is also pending. Crime. The young man faces a complaint for serious speeding violation. According to collect According to the Berliner Zeitung newspaper, since a legal reform in 2023, Swiss courts have more room for maneuver when imposing sentences, which in some cases allows the prison sentence to be replaced by a fine if it is a first offense. Even so, according to the media, the law contemplates in these cases a minimum penalty of one year in prison, in addition to a fine and withdrawal of the license, and in the most serious cases the vehicle used may even be confiscated. The driver is now free, although he remains under investigation while the judicial proceedings progress. Cover image | Google Maps In Xataka | Electric car sales in Europe, on a revealing map with a devastating peninsula. Spoiler: it is not the Ibérica

We know exactly where and when the longest solar eclipse in history will occur: our great-great-grandchildren will see it

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On July 16, 2186, the Moon will align perfectly between the Earth and the Sun, creating an eclipse without historical precedent. Unless he eccentric millionaire determined to rejuvenate succeed, none of us will be here to see it. But our descendants will want to spend that day somewhere in Colombia, Venezuela or Guyana. 7 minutes and 29 seconds. The longest total solar eclipse in history will exceed by almost two seconds the duration of the one that held the record until now: the eclipse of June 15, 743 BC, which reached a totality of 7 minutes and 27 seconds over the Indian Ocean, near present-day Kenya and Somalia. No eclipse will have lasted as long from before 4000 BCand none will do so until after 8000 AD, so we can be sure that it will be a truly unique astronomical event. The longest total solar eclipse in an interval of 12,000 years. The Moon will darken South America. The historic solar eclipse of 7 minutes and 29 seconds will not occur on land: the strip of totality will reach its longest duration over the Atlantic Ocean. However, northern South America will also enjoy extraordinarily long totalities. Especially in Colombia (from Cali to Puerto Ayacucho), Venezuela (from the Orinoco to Imataca) and Guyana (in the entire northern half of the country, including Georgetown). The show will not be limited to that narrow strip. Virtually all of South America, including the entire Brazilian territory, will be able to observe a partial eclipse of great magnitude. The eclipse will also be partially visible from Mexico to Paraguay, and west of Africa. In Spain it will barely touch the Canary Islands at sunset. Why will it last so long? The reason for this extreme duration is a “perfect storm” in the positions of the three bodies. The Earth will be at its furthest point from the Sun (its aphelion), which will make the solar disk appear slightly smaller. The Moon, for its part, will be at its closest point to the Earth (its perigee), so its apparent disk will be larger. And finally, the path of the eclipse will pass very close to the Earth’s equator. This combination maximizes the time it takes for the Moon’s shadow to sweep across the Earth’s surface. How are we so sure? Eclipse prediction is one of the most successful feats of computational astronomy. Scientists feed their supercomputers the current positions and velocities of the Earth and Moon, and then use Newton’s laws of motion to figure out what will happen several centuries or even millennia from now. These algorithms are actually models that integrate gravitational equations to project their positions into the future. And they do it with astonishing precision, usually within a margin of error of less than a minute over hundreds of years. First cousin of the great eclipse of 2024. The total solar eclipse of 2186 belongs to the same “lineage” as the Great North American Eclipse of April 8, 2024, the Saros cycle 139. A Saros cycle is a period of approximately 18 years, 11 days and 8 hours, after which the Sun-Earth-Moon geometry is repeated in an almost identical way, producing a very similar eclipse but displaced about 120 degrees to the west. Discussions among eclipse enthusiasts are already fantasizing about what the hunt for this event will be like in 2186. There is talk of fleets of cruise ships positioned in the Atlantic and flights in hypersonic planes to chase the shadow and further extend the experience of totality. Although we will not see the millennium eclipse, there is no need to wait that long to experience a totality: on August 12, 2026, Spain will chain the first of three Iberian eclipses. They are not the “wonders of the cosmos”, but we cannot complain. A version of this article was published in July 2025 Image | THAT In Xataka | Two European spacecraft synchronized in space to create an artificial eclipse. It is a before and after in solar science

The longest solar burst ever detected lasted almost three weeks. Four ships had to join forces to study it

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Four different spacecraft have confirmed the detection of the longest solar burst ever recorded. measured to date. Previously, the longest known lasted 5 days. However, the one just described in a studio in The Astrophysical Journal Letter It was much longer, as it lasted from August 21 to September 9, 2025. No more and no less than 19 days. Four ships, one answer. This very special solar burst was detected for the first time by Solar Orbiter of the European Space Agency (ESA). The objective of this spacecraft is none other than to study the poles and solar winds, as well as the Sun’s magnetic field, from a close distance. It was not the first solar burst that he had detected, but he had never encountered one of these characteristics. The results were confirmed twelve days later by the ships wind and Parker Solar Probeboth from NASA. A few days later, the STEREO-Aalso from NASA, again supported the same result. A type IV burst. This long burst is a type IV burst. A phenomenon that occurs when electrons are trapped in the Sun’s magnetic field is known as a solar flare, so that they begin to spiral around its lines, generating a large amount of electromagnetic radiation. There are five types. Those of type IV They have wide bandwidths and can last for hours. The duration of this was much longer, which is why it attracted so much attention. The key is in coronal mass ejections. Solar flares are completely harmless. And, unlike other phenomena, such as solar winds or coronal mass ejections, they do not release plasma or charged particles, only radio waves. Therefore, they would not affect telecommunications on Earth. Now, in this case it has been seen that the burst could be related to coronal mass ejections. According to the clues collected by STEREO-A and the scientists’ reconstructions, there must have been 3 coronal mass ejections that served as food for the radio burst. But what is that? Coronal mass ejections are abrupt releases of plasma that are generated in the solar corona when a lot of energy accumulates in it. Possibly, these three ejections were supplying electrons to the explosion, such that there were always electrons trapped and rotating around the magnetic field. That, possibly, is what made this burst last so long. When he was running out of “food”, the Sun was giving him more. Very important. These types of findings are very important because they help us better understand how the Sun works. Solar activity follows cycles of approximately 11 years, with peaks and low points. In 2025 there was a big peak, especially active. Studying everything that happened at that time is very useful to better understand this type of phenomena, especially those that can affect telecommunications, such as solar winds or coronal mass ejections themselves. In this case, the ejecta had not been seen as such, but the long trail they left had been seen. Analyzing that footprint is as useful as it is for paleontologists to study those left by the dinosaurs. Image | THAT In Xataka | The Webb and Hubble telescopes simultaneously observed Jupiter’s auroras. The problem is that they didn’t see the same thing

Navarra already has its longest stretch radar operational. It covers 30 kilometers, and yet it is not the longest in Spain

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Navarra has placed a medium speed radar on the AP-68 that controls more than 30 kilometers in a row between Cortes and Tudela. The device He is already monitoring this section and sanctioning. It is one of the longest in the country, but not the one that most. And the trend indicates that there will be more. The radar in question. The device is installed on the AP-68, in a descending direction, between kilometer points 115,027 and 84,483, that is, the route from Cortes to Tudela. In total, 30,544 kilometers under continuous surveillance. In addition, Navarra has launched a second section radar on the N-121-A, in an increasing direction, between kilometers 26.76 and 40.79, covering almost 14 kilometers in the area of ​​the Belate and Almandoz tunnels. Both devices are already operational and sanctioning. Why have they settled there? The Government of Navarra and the DGT justify the decision with the accident data. According to the information published about the installation, in the section of the AP-68 76 accidents were recorded between January 2022 and June 2025, of which 19 left victims, with one deceased, one seriously injured and 25 lightly injured. On N-121-A the balance in the same period was 56 accidents. How this type of radar works. It does not measure the speed at a specific point but rather calculate the average throughout the entire journey. One camera reads the license plate at the beginning of the section and another at the end. The system determines how long the vehicle has taken to travel it and, if that time is less than the minimum that fits with the established speed limit, the report is processed automatically. What it can cost you. The sanctions range from 100 euros without loss of points in the slightest excesses to 600 euros and six license points in the most serious cases. Prompt payment, paid within 20 calendar days following notification, allows the financial fine to be reduced by half, although the points are still lost. It is not the longest in Spain. The national record It is still maintained by a radar installed on the CL-615in Palencia, which controls 33 kilometers in an increasing direction, as we counted a while ago. The Navarrese rider on the AP-68 is less than three kilometers from that mark, which places him in second position among the longest. And he is not alone in that category: according to data from the DGT, There are 16 section radars in Spain that exceed 10 kilometers. Expansion. In 2024 there were 92 section radars on the roads managed by the DGT. In 2025 the figure rose to 110 and today there are 149, according to they count from Motor.es. In addition, the DGT has planned a new wave of installations for the second half of 2026, aimed mainly at secondary roads and conventional roads, which is precisely where the majority of fatal accidents are concentrated. Navarra takes charge. The entry into service of this radar makes more sense than it seems. Navarre He assumed official ownership on January 29 of this year. of the almost 40 kilometers of the AP-68 that run through its territory. And as of July 1, the regional community will also have the power to directly process, resolve and collect traffic fines, according to Navarra.com. That is to say, the provincial government installs a large radar on a road that it has just assumed as its own and does so just before it can also manage the income it generates. Cover image | DGT In Xataka | Death to the oldest “shadow toll” in Spain: Murcia is going to say goodbye at the end of the RM-15 system

At 11 km long and with a roof with a light show, China’s longest underwater tunnel has become a tourist attraction

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Under the waters of Lake Taihu, in the Chinese province of Jiangsu, lies the longest underwater tunnel ever built in China. Although it serves today as a great solution to decongest one of the most dynamic regions in the country, it has also become, almost by surprise, a tourist destination on its own merits. The reason: a majestic ceiling full of LED lights that change color and an architecture almost designed more to be contemplated than to be functional. A key point. As we mentioned, the tunnel extends under Lake Taihu, in Jiangsu province, about 50 kilometers east of Shanghai. It aims to connect the expressways of Suzhou, Wuxi and Changzhou to relieve traffic pressure in the lakeside cities, while also serving to boost economic development from the Yangtze River Delta region. It is also a segment of the highway that connects Shanghai and Nanjing, the former national capital. For this reason, it is a key piece in China’s infrastructure network, but its design and light show have also led to it being transformed into a whole tourist experience. Figures. With 10.79 kilometers in length, the tunnel had a cost of about 9.9 billion yuanabout 1,230 million euros. Work began in 2018 and lasted almost four years. To build the two-way tunnel, with six lanes and 17.45 meters wide, more than two million cubic meters of concrete were used. For ventilation, there are three complexes distributed along the surface of the lake that guarantee air circulation inside. The challenge of building under the mud. It was not a simple work. The bed of Taihu Lake is formed by large accumulations of clayey silt, which made it impossible to use conventional excavation methods with tunnel boring machines. The engineering team opted for a cofferdam system: the route was divided into nine sections and, in each one, a temporary dike was built to “create solid ground” and work dry. Once that section was finished, it was filled with water and moved on to the next. According to collect Tunnels & Tunnelling, one of the biggest challenges was waterproofing the structure, since at some points the tunnel is 20 meters below the lake bed. Thes LED lights yesThey always improve everythingeither. Their figures and the work that had to be done for something of such magnitude to materialize is impressive. But the tunnel has attracted more and more attention for a clear reason: its roof. Those responsible They installed LED lights on the roof of the tunnel to combat driver fatigue during what would otherwise be a very monotonous journey underground. The panels do not simply project a uniform color, but rather show images that change. Ventilation and architecture. But the LEDs on the ceiling are not the only eye-catching element. The three ventilation points that emerge on the surface of the lake have been conceived as sculptural pieces. According to China Dailythe one located in the center of the tunnel was transformed into an artificial island 150 meters in diameter; that on the western side, near Mashan, is shaped like a conch; and the one on the eastern side, next to Nanquan, evokes the silhouette of an ancient boat. The most striking is the one known as “Jade Snail”: 45 meters in diameter and 39 meters high, it is equipped with 174,000 LED light points. A tunnel that generates tourism. The CCCC construction company points out that the Taihu tunnel is now the second highway between Shanghai and Nanjing, and has increased the number of visitors to the tourist enclaves of Lingshan and Nianhua Bay by 50%. The Mashan area, directly connected by the tunnel, is home to the Lingshan Great Buddha, one of the largest in the world and a pilgrimage destination for millions of people. Liu Xiaoyu, head of Wuxi National Taihu Lake Tourism Resort, pointed out told China Daily that “the tunnel will bring more tourists to the Lingshan Scenic Area and hotels in the area.” recordd. At almost 11 kilometers, the Taihu is the longest underwater tunnel in China, but it is not the first in the world. The title of longest underwater road tunnel remains with the Norwegian Ryfastwith 14.3 kilometers, connecting the city of Stavanger with the municipality of Strand. On the other hand, if we talk about underwater tunnels in general, the Eurotunnel (which links England and France by rail) retains the absolute record with 37.9 kilometers of submerged section. Images | CGTN In Xataka | Xiaomi or Xpeng car factories are so advanced that they have become the favorite destination of Chinese schools

Mexico is about to finish one of the longest bridges in Latin America

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If you’ve been to Cancun, it’s very likely that you’ve been through the same thing: short trips that take much longer than expected, especially when it’s time cross towards the hotel zone. The city depends largely on a connection that, at peak times or in high season, becomes a bottleneck that is difficult to avoid. That is the problem that Mexican authorities have been trying to alleviate for years. Now, everything indicates that the answer is close to materializing with the Nichupté Vehicular Bridgean infrastructure that seeks to offer a direct alternative and significantly reduce travel times. The answer to this problem is not only a distant promise, but a work that is approaching its final phase. According to the Secretariat of Infrastructure, Communications and Transportation (SICT), the Nichupté Vehicular Bridge is in his last works and the most recent official forecast places its opening towards the end of April. In this final section, the work focuses on verifying that the structure responds as expected, with load tests of up to 150 tons and vibration measurements using accelerographs. A new access to alleviate the Cancun bottleneck To understand the scope of the work, it is advisable to stop at its dimensions, which are not always clearly explained. The infrastructure adds 11.2 kilometers in total: 8.8 km correspond to the bridge over the lagoon and 2.4 km to the junctions at both ends. According to the SICT, this is the key difference between the complete work and the section that directly crosses the Nichupté lagoon system. Added to this are three traffic lanes, one of them reversible, as well as a 103-meter metal arch and a cycle path. Beyond its dimensions, the key is how it is integrated into the real mobility of the city. The new route will connect the Boulevard Luis Donaldo Colosio with the Kukulcan Boulevardtwo essential points to access the hotel zone, one of the main tourist and traffic hubs of Cancun. This connection, those responsible explain, would make it possible to reduce journeys that today can take up to an hour and a half to just about 10 minutes, an estimate that should be understood as the objective of the project. Furthermore, the infrastructure is planned as an alternative route in emergency situations, something especially relevant in an area exposed to natural phenomena. The scope of the work is also measured by who it aims to impact. According to data from the Government of Mexicothe bridge is designed to benefit more than 1.3 million inhabitants of the region, in addition to the more than 20 million tourists who visit Cancun every year. Regarding the expected traffic, the official figures have not been entirely uniform: in November 2025 the SICT spoke of an annual average daily traffic of 12,612 vehicles, while in January 2026 it raised that forecast to 20 thousand. Added to this is its impact during construction, with around 51 thousand direct and indirect jobs generated, according to the secretariat itself. But not everything is reduced to mobility and travel times. The passage of the bridge through the Nichupté lagoon system introduces a delicate variable, that of the impact on a sensitive ecological environment. The Ministry of Infrastructure, Communications and Transportation maintains that the project has been developed under 10 programs and 25 environmental subprograms focused on mitigating this effect. In that framework 306 hectares of mangrove have been restoredrehabilitated 118 hectares of seagrasses and relocated more than 2,100 specimens of fauna, in addition to rescuing native vegetation. Cancun has been living for years with an obvious limitation in its mobility, especially in access to its most touristic area, and that pressure has only grown over time. He Nichupté Vehicular Bridge It is proposed as one of the most ambitious responses to this problem, both due to its scale and the role it aspires to play in the day-to-day life of the city. With the work in its final phase and an opening scheduled for the end of April according to the most recent official communication, it will soon be possible to verify to what extent it meets the expectations that have accompanied the project since its conception. Images | Secretariat of Infrastructure, Communications and Transportation / SICT Quintana Roo Center In Xataka | China has already conquered the cargo ship industry: now it has begun to compete in the mega-cruise ship industry

Mexico is about to finish one of the longest bridges in Latin America

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If you’ve been to Cancun, it’s very likely that you’ve been through the same thing: short trips that take much longer than expected, especially when it’s time cross towards the hotel zone. The city depends largely on a connection that, at peak times or in high season, becomes a bottleneck that is difficult to avoid. That is the problem that Mexican authorities have been trying to alleviate for years. Now, everything indicates that the answer is close to materializing with the Nichupté Vehicular Bridgean infrastructure that seeks to offer a direct alternative and significantly reduce travel times. The answer to this problem is not only a distant promise, but a work that is approaching its final phase. According to the Secretariat of Infrastructure, Communications and Transportation (SICT), the Nichupté Vehicular Bridge is in his last works and the most recent official forecast places its opening towards the end of April. In this final section, the work focuses on verifying that the structure responds as expected, with load tests of up to 150 tons and vibration measurements using accelerographs. A new access to alleviate the Cancun bottleneck To understand the scope of the work, it is advisable to stop at its dimensions, which are not always clearly explained. The infrastructure adds 11.2 kilometers in total: 8.8 km correspond to the bridge over the lagoon and 2.4 km to the junctions at both ends. According to the SICT, this is the key difference between the complete work and the section that directly crosses the Nichupté lagoon system. Added to this are three traffic lanes, one of them reversible, as well as a 103-meter metal arch and a cycle path. Beyond its dimensions, the key is how it is integrated into the real mobility of the city. The new route will connect the Boulevard Luis Donaldo Colosio with the Kukulcan Boulevardtwo essential points to access the hotel zone, one of the main tourist and traffic hubs of Cancun. This connection, those responsible explain, would make it possible to reduce journeys that today can take up to an hour and a half to just about 10 minutes, an estimate that should be understood as the objective of the project. Furthermore, the infrastructure is planned as an alternative route in emergency situations, something especially relevant in an area exposed to natural phenomena. The scope of the work is also measured by who it aims to impact. According to data from the Government of Mexicothe bridge is designed to benefit more than 1.3 million inhabitants of the region, in addition to the more than 20 million tourists who visit Cancun every year. Regarding the expected traffic, the official figures have not been entirely uniform: in November 2025 the SICT spoke of an annual average daily traffic of 12,612 vehicles, while in January 2026 it raised that forecast to 20 thousand. Added to this is its impact during construction, with around 51 thousand direct and indirect jobs generated, according to the secretariat itself. But not everything is reduced to mobility and travel times. The passage of the bridge through the Nichupté lagoon system introduces a delicate variable, that of the impact on a sensitive ecological environment. The Ministry of Infrastructure, Communications and Transportation maintains that the project has been developed under 10 programs and 25 environmental subprograms focused on mitigating this effect. In that framework 306 hectares of mangrove have been restoredrehabilitated 118 hectares of seagrasses and relocated more than 2,100 specimens of fauna, in addition to rescuing native vegetation. Cancun has been living for years with an obvious limitation in its mobility, especially in access to its most touristic area, and that pressure has only grown over time. He Nichupté Vehicular Bridge It is proposed as one of the most ambitious responses to this problem, both due to its scale and the role it aspires to play in the day-to-day life of the city. With the work in its final phase and an opening scheduled for the end of April according to the most recent official communication, it will soon be possible to verify to what extent it meets the expectations that have accompanied the project since its conception. Images | Secretariat of Infrastructure, Communications and Transportation / SICT Quintana Roo Center In Xataka | China has already conquered the cargo ship industry: now it has begun to compete in the mega-cruise ship industry

the longest railway tunnel in the world

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Megastructures have a what-do-I-know-what-do-I-know-what makes us love them. It makes perfect sense: They are colossal works that humanity has been doing for millennia and in which we increasingly use more and more sophisticated machinery. There is also a certain sense of competition, and if a few months ago Europe boasted of longest railway tunnel in the worldtoday we have to talk about an even more difficult one: one twice as long and underwater. It is the Bohai Strait Railway Tunnel. AND will be in Chinaclear. Dalian-Yantai. To the sides of Beijing are the provinces of Liaoning and Shandong. The first has 44 million inhabitants. The second, 101 million. They are two important nerve centers in China, but there is a problem: they are separated by the Sea of Bohai and the only way to get from one to the other is by ferry, which takes about eight hours, or by going around the bay on a 1,500-kilometer trip. Given the importance that the area was gaining, in 1992 the idea of ​​a connection across the strait arose that would link the cities of Dalian and Yantai. Although China has accustomed us to mega constructions in record timein this case the logistics were complicated and it was in 2012 when a research group was established under the supervision of the Chinese Academy of Engineering to see if it was viable and, in 2019, they began to talk seriously about the project. Specs. A structure that combined bridges, islands and tunnels – like the Hong Kong Zhuhai-Macao– those in charge of the project agreed that the best solution would be a single railway tunnel whose characteristics are… colossal: 125 kilometers in total, 90 of them underwater. Designed for trains traveling at a speed of 220 km/h. Built 80 meters below the seabed. Two main tunnels of 10 meters in diameter. The most important thing: of the eight hours by ferry or more than ten by car, the journey would take about 40 minutes. It is a considerable reduction in time that will help not only transport people, but also what is most interesting in the region: goods and commerce. Train>car. The price of the tunnel has varied over long of these years. The estimate a decade ago was 200 billion yuan, about 30 billion euros. Currently, it is closer to 300 billion yuan, about 40 billion euros. Everything to unite two of the most powerful regions of China in terms of trade and more than the colossal Three Gorges Dam. HE esteem that it would take about ten years to recover the public-private investment in the infrastructure, and the reason why the tunnel has been planned as a railway tunnel instead of a mixed one (cars plus trains) is for safety reasons. Bohai’s will be more than twice as long as the Eurotunnelso creating such a long underwater tunnel suitable for cars would be extremely expensive and complex as it would require adequate ventilation. Furthermore, in the event of an accident, emergency response would be more difficult. What there will be are shuttle trains that will allow both cars and trucks to be loaded. This is something that is already being explored in other parts of the world and, recently, we have seen it raised in the American transcontinental. Challenges. Now, it’s not going to be easy. The topography of the bay bottom varies between areas of just 10 meters to others that reach almost 90 meters deep. In addition, there are active faults in the area and it is a region with high seismic activity. In fact, it is close to the Tan-Lu fault, one of the most active in China, which implies a thorough study to adapt the structure to possible earthquakes. Ecology. On the other hand, the ecosystem. Apart from being a sensitive area in terms of earthquakes, the tunnel would pass through ecologically sensitive areas. It is the habitat of the spotted seal, protected in China, and also includes migration routes for both fish and birds. You have to wait seated. And if we speak in the future it is because the works have not started. For now, it is about a projectbut in recent months important steps have been taken. In early 2024, the Bohai Tunnel was included in several national strategic documents, and in May this year incorporated to the Development Plan of the Modern Comprehensive Transportation System of the 14th Five Year Plan. In these 30 years, steps have been taken studying the feasibility of the project and exploratory drilling, and more recently more and more voices have emerged that mention the need to promote this Bohai corridor. When will the works begin? It is not known, but 2026-2030 is consider as the window of opportunity for it. Either way, if it ends up happening, Bohai will not only be – by far – the longest underwater railway tunnel in the world: it will also be one of the largest tunnels, overall. Images | Tambo, Ekem In Xataka | China has built the highest bridge in the world and has done what it must: turn it into a show

The longest train in history was born in 2001 and since then no one has surpassed it

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The train is the backbone of many countries. In Europe we know it wellin Latin America is catching up and the China and Japan current ones would not be understood without it. Another country where it is vital is Australia, although more than for the movement of the population, for the transport of goods. And, in 2001, in the heart of Western Australia, the BHP Iron Ore It made history by becoming the longest train in the world. More than seven kilometers long that have not yet been equaled. Necessary. One of the most powerful industries in Australia is mining, so much so that there are even mining influencers that recruit workers from any country. In the late 90s, mining companies faced a challenge: an increasing amount of mineral had to be transported from the source to the export ports. It was a challenge because logistics costs had to be kept under control so that prices did not skyrocket. Traditionally, we would have chosen to put more trains into operation, but it would not be efficient because we would have to pay for more fuel, for the use of the infrastructure and the salaries of a larger crew. Come into play BHPthe Australian giant that is one of the largest mining companies in the world, with an idea: what if we set up a huge train to load iron? This is how the Iron Ore train was born. The BHP Iron Ore train. Its dimensions were extraordinary: a convoy made up of 682 wagons, 5,648 wheels, a loaded weight of almost 100,000 tons and a length of 7,353 kilometers. Imagine 22 Eiffel Towers lying down and aligned, like this. To pull such a monster, eight locomotives GE AC6000CW (each with 6,000 HP) with 16-cylinder engines were distributed throughout the vehicle. Apart from the front, the rest were within a kilometer of each other and managed to complete a 275 kilometer Yandi journey, with a cargo of Newman mines, to Port Hedland in just ten hours. The pace was slow, yes, but the important thing about this was not It was the Guinness record that he achieved, but the proof of a technology called Distributed Power. Distributed Power. This was BHP’s goal, to prove that the technology worked. And it basically consists of what we have said: distributing the locomotives along the train instead of concentrating them in the front so that the traction and braking force is greater, more uniform and, also, more efficient. Everything worked like a Swiss clock thanks to great precision and harmony between the locomotives, which were controlled by a single driver in the front system. It’s long, and there’s no train If Distributed Power was the technology, the control system was the LOCOTROL. The leading locomotive communicated with the remote ones through a radio frequency system that synchronized all acceleration and braking operations. This allowed lateral forces and friction to be drastically reduced when cornering, which reduced both wheel wear and the risk of derailment and, in turn, it is estimated that between 4 and 6% less fuel was consumed. Pilbara. The BHP Iron Ore was a technical prodigy that set the record for the longest train in the world in 2001, but if you are a train enthusiast, don’t pack your bags yet to see it in action: it was a one-time event, so much so that there is very little material about it. Once the technology was proven, what BHP did was apply it to smaller trains. The Pilbara is the region in which much of its operations are concentrated, and what the company currently operates are several regular trains with formations of about four locomotives with about 270 carriages. It is still impressive, since the length of these trains is close to three kilometers and they have a loaded weight of about 40,000 tons. The company’s next steps are to electrify these trains to reduce emissions, and one trick will be to use regenerative braking to recharge the batteries in sloped areas. It is something that other companies are also testing in the country. Similar attempts. Thus, the BHP Iron Ore was a prodigy, but also something unique that has not been matched, not even close, more than 20 years after its launch for that test. In August this year, Indian Railways commissioned the Rudrastraa 354-car, 4.5-kilometer-long train powered by seven locomotives (two at the front and one every 59 cars). And in Europe, tests are also being carried out with distributed power trains, but for kilometer and a half trains. In the end, they are all very far from the Iron Ore both in length and weight, but beyond the record in 2001 it was shown that this distributed power technology was a solution for trains longer than conventional ones. We’ll see if at some point someone needs to create a longer train, but it seems complicated. Images | WabtecBHP In Xataka | The longest train journey in the world: more than 18,000 kilometers between Portugal and Singapore without changing transport

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